diff --git a/ai-hub/app/api/routes/sessions.py b/ai-hub/app/api/routes/sessions.py
index f9f2455..ee7276c 100644
--- a/ai-hub/app/api/routes/sessions.py
+++ b/ai-hub/app/api/routes/sessions.py
@@ -298,6 +298,7 @@
         """
         import uuid
         from datetime import datetime
+        from sqlalchemy.orm.attributes import flag_modified
 
         session = db.query(models.Session).filter(
             models.Session.id == session_id,
@@ -315,6 +316,8 @@
         new_node_ids = set(request.node_ids)
         detached_nodes = old_node_ids - new_node_ids
         
+        print(f"[DEBUG] AttachNodes Request for {session_id} - Old: {old_node_ids}, New: {new_node_ids}, Detaching: {detached_nodes}")
+        
         session.attached_node_ids = list(request.node_ids)
 
         # Initialize sync status for new nodes
@@ -337,6 +340,8 @@
             sync_status.pop(nid, None)
 
         session.node_sync_status = sync_status
+        flag_modified(session, "attached_node_ids")
+        flag_modified(session, "node_sync_status")
         db.commit()
         db.refresh(session)
 
diff --git a/ui/client-app/src/pages/CodingAssistantPage.js b/ui/client-app/src/pages/CodingAssistantPage.js
index 2df60d8..044d186 100644
--- a/ui/client-app/src/pages/CodingAssistantPage.js
+++ b/ui/client-app/src/pages/CodingAssistantPage.js
@@ -98,9 +98,12 @@
     setIsInitiatingSync(true);
     try {
       await attachNodesToSession(sessionId, attachedNodeIds, syncConfig);
-      await fetchNodeInfo();
-      // M3: Explicitly close the selector so the user sees the page status
+      // M3: Explicitly turn off the editing mesh ref and modal BEFORE fetching
+      // so the server's newly saved attached nodes replace the user checkboxes immediately
+      isEditingMeshRef.current = false;
       setShowNodeSelector(false);
+
+      await fetchNodeInfo();
     } catch (err) {
       alert(`Sync Error: ${err.message}`);
     } finally {